PERIODIC TABLE

Calcium

Atomic No. 20 Ca Calcium

About Calcium

Calcium is an alkaline earth metal with atomic number 20 that generally forms compounds in the +2 oxidation state. Calcium compounds are important in cement, glass and ceramics, while calcium fluoride serves in specialized optical components. Calcium sulfide is also a host material for phosphors, with europium activated compositions producing red emission that has been investigated for lighting and other luminescent applications.

Properties

Atomic Number
20
Atomic Symbol
Ca
Atomic Mass
40.078
CAS No.
7440-70-2
Density
1.55 g/cm³
Series
alkaline earth metal
Melting Point
842°C
Boiling Point
1,484°C
Thermal Conductivity
2 W/cm °C
Heat of Fusion
8.54 kJ/mol
Heat of Vaporization
155 kJ/mol
Electronegativity
1 pauling
Crystal Structure
Cubic
Electrical Conductivity
2.9×107 S/m

Calcium Products

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